• 한국환경과학회지
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• 제18권8호
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• pp.899-910
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• 2009

We classified wind sectors according to the wind features in South Korea. In order to get the information of wind speed and wind direction, we used and improved on the atmospheric numerical model. We made use of detailed topographical data such as terrain height data of an interval of 3 seconds and landuse data produced at ministry of environment, Republic of Korea. The result of simulated wind field was improved. We carried out the cluster analysis to classify the wind sectors using the K-means clustering. South Korea was classified as 8 wind sectors to the annual wind field.

• The Korean Journal of Ecology
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• 제15권2호
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• pp.117-125
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• 1992

TWINSPAN(two-way indicator species analysis), DCCA(detrended canonical correspondence analysis) and polar ordination method wee used so as to analyze the the relation between forest vegetation and hibitat of mudungsan(1, 187m) located in kwangju area. Vegetationsurvey consulted 1:25, 000 topographical map, set up 41 quadrats and analyzed from April, 1990 to August, 1991. Forest vegetation of mudungsan was classifild to quercus acutissima community, fraxinus mandshurica community, quercus mongolica community, quercus serrata community, quercus dentata community, quercus variabilis community, and pinus densiflora community by TWINSPANmethod, and this almost coincide with the result of plar ordination. according to DCCA analysis, P. densiflora community was formed in xeric and low altitude region which soil nutrient was poor, compared with other communities. q. variabilis and q. acutissima community wee distributed in the region that low altitude and organic matter content was comparatively low, but q. acutissima community was formed in a damp region while q. variabilis community in a xeric region. q. mongolica and f. mandshurica formed the communities in a high altitude region, especially f. mandshurica cmmunity was distributed in a high humidity region. According to polar ordination analysis, the forest vegetation was classified to 7 communities by means of environmental gradient such as humidity, organic matter, ph, temperature, c.e.c and P2O5.

• 한국측량학회지
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• 제14권1호
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• pp.89-95
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• 1996

항공사진측량 분야에 대한 GPS 기술 응용의 한 예로, 수신기를 항공기에 탑재하여 카메라의 위치를 정확히 측정함으로써 기존의 항공사진측량에서 필요했던 많은 지상기준점을 항공기준점(aerial control points)으로 대체하려는 이론적 연구를 수행했다. 본 연구에서는 GPS 데이타를 항공사진측량에 이용하기 위해 여러 가지 경우에 대해서 Simulation을 통해 항공사진측량에서 대상점의 위치결정에 영향을 주는 조건들을 규명하고, 이에 따라 1:1,000 지형도 작성을 위해 필요한 조건들과 실제의 적용을 위한 값을 제시하였다. 본 연구의 결과는 104매의 사진 블럭에서 지상측량을 포함하고, $10\mu{m}$ 이상의 정밀도로 좌표측정을 하였을 경우에 6점의 지상기준점 만으로도 충분한 정도의 결과를 얻을 수 있음을 보임으로써 이 기술의 실제적용이 이론적으로 가능함을 입증하였다.

• International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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• 제6권1호
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• pp.22-29
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• 2003

This research aims at investigation of accuracy potential of RTK(Real-Time Kinematic) GPS in combination with Echo Sounder(E/S) for the coastal mapping. Apart from this purpose, the accuracy of ambiguity resolution with the OTF(On The Fly) method was tested with respect to the initialization time. The result shows that the accuracy is better than 1cm with 5-minute initialization in the distance of 10km baseline. The seaside topography was measured by the RTK GPS only, on the other hand the seafloor topography was surveyed in combination of RTK GPS and E/S. Comparing to the volume of seaside measured by RTK GPS and digital topographical map, the difference of only 2% was achieved. This indicates that the coastal mapping. As a result, it has been revealed that every possible noise in surveying could be corrected and the accuracy could be improved. The accuracy of GPS data acquired in real time was as good as that acquired by post processing. It is expected that it will be useful for the analysis of coastal geographic characteristics because DTM(Digital Terrain Model) can be also constructed for the harbor reclamation, the dredging, and the variation of soil movement in a river.

• 전자공학회논문지
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• 제52권12호
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• pp.46-54
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• 2015

SAR(Synthetic Aperture Radar)는 radio wave를 이용하여 영상 정보를 얻는 Radar이다. Platform이 radio wave를 방사하여, 대상 물체에서 되돌아오는 후방 산란파 (Back-scattering) 신호를 거리에 따라 2차원 영상(SAR image)으로 기록하여 지형도를 작성한다. 본 논문에서는 SAR image 복구를 위해 SAR image processing에서 다양한 window를 적용하는 시뮬레이션을 통하여 window의 적용 효과를 연구하였으며, 그 결과 신호의 SNR 측면에서는 Flattop window가 가장 좋은 성능 향상을 보여 주는 것을 확인하였다.

• 한국정보통신학회논문지
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• 제13권6호
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• pp.1111-1116
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• 2009

모바일 GIS 환경에서 등고선을 표현하기위해서는 지형도와는 별도로 서버로부터 해당 수치 데이터를 전송받아야 한다. 이때 전체 데이터를 전송받는 것은 모바일 환경의 특성상 받아들일 수 없다. 그리고 대표 지점들의 값을 전송받아 보간법으로 중간 데이터를 생성하는 기법은 계산 오버헤드와 등치선의 정확도 문제가 있다. 이 논문에서는 고도정보를 이용하여 생성하는 등고선 정보를 모바일 클라이언트로 효율적으로 전송하기 위한 자료구조와 알고리즘을 소개하고 구현 결과를 보인다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 추계종합학술대회 B
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• pp.151-154
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• 2008

모바일 GIS 환경에서 등치선을 표현하기 위해서는 지형도와는 별도로 서버로부터 해당 수치 데이터를 전송 받아야 한다. 이때 전체 데이터를 전송받는 것은 모바일 환경의 특성상 무리가 따른다. 그리고 대표값을 전송받아 보간법으로 중간 데이터를 생성하는 기법은 계산 오버 헤드와 등치선의 정확도 문제가 있다. 이 논문에서는 고도정보를 이용하여 생성하는 등고선 정보를 모바일 클라이언트로 효율적으로 전송하기 위한 자료구조와 알고리즘을 소개하고 구현 결과를 보인다.

• 한국조경학회지
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• 제24권3호
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• pp.115-132
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• 1996

The purpose of this study is to estimate the soil loss amount with Geographic Information System according to the land use change of Buju mountain area in Mokpo city. To estimate the soil loss, Universal Soil Loss Equation which is the most proper technique to predict soil loss in this site condition is adopted and IDRISI, a raster GIS software, is used. GIS application with USLE is very efficient to estimate soil loss accurately and fastly. In order to decide value and to find application method of USLE factors, we used existing rainfall erosion index, soil erodibility analysis, slope length, slope steepness, vegetation management and practices, which are rated by GIS through the analysis of various studies related USLE. The result of this study was compared with the previous other researches to verify our method of constructing numerical data of USLE's factors. The result of verification of our way showed significance for the soil loss in forest area. But the result of verification for the soil loss in forest area. But the result of verification for the soil loss of cultivated area showed some errors. It seems that this result was due to local variation of topographical map.

• 한국측량학회지
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• 제32권3호
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• pp.217-223
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• 2014

With precise sensor position, attitude element, and imaging resolution, a simulated geospatial image can be generated. In this study, a satellite image is simulated using SPOT ortho-image and global elevation data, and the geometric similarity between original and simulated images is analyzed. Using a SPOT panchromatic image and high-density elevation data from a 1/5K digital topographic map data an ortho-image with 10-meter resolution was produced. The simulated image was then generated by exterior orientation parameters and global elevation data (SRTM1, GDEM2). Experimental results showed that (1) the agreement of the image simulation between pixel location from the SRTM1/GDEM2 and high-resolution elevation data is above 99% within one pixel; (2) SRTM1 is closer than GDEM2 to high-resolution elevation data; (3) the location of error occurrence is caused by the elevation difference of topographical objects between high-density elevation data generated from the Digital Terrain Model (DTM) and Digital Surface Model (DSM)-based global elevation data. Error occurrences were typically found at river boundaries, in urban areas, and in forests. In conclusion, this study showed that global elevation data are of practical use in generating simulated images with 10-meter resolution.

• 건축역사연구
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• 제13권4호
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• pp.125-138
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• 2004

Open-rectangular plan Hanok is one of the major types that compose the urban tissues of Bukchon, a typical traditional residential area in Seoul. Through the comparison of the cadastral map of 1912 and the aerial photograph of 1962, the paper has given the outline of the and the distribution of Open-rectangular plan Hanok at Bukchon. And the paper defines the characteristics of Open-rectangular plan Hanok at Bukchon as followings. First, Open-rectangular plan Hanok at Bukchon is the mutated type of Open-rectangular plan Hanok in Kyong-gi Province. Second, the composition and characteristics of Bakat-chae and outer-courtyard have been changed through the adaptation itself to the compact lots of urban neighborhood. Third, the composition and characteristics of An-chae has not been changed except the inner corner bay, that gives the lights and view to An-bang through the window. And the comparison and observation of four examples, the paper defines the identities of Open-rectangular plan Hanok at Bukchon. The partial transformation comes from the conflicts and adjustments with the structure of alley and the topographical condition of lots.